Porcelain Doll recipe cost - 4 Bone clay 1 linen cloth 2 plant fibres

Would it be possible to reduce the amount of bone clay porcelain doll would need. Maybe down to 2 or even 1. They could just as well need other added ingredients as in return for the reduced cost. Currently they are just not worth the effort.
Just reducing the cost of the bone clay might make it to good but compared to abacus it still isn't to overpowered. But the abacus isn't that expensive compared to the porcelain doll and still is on equal or even slightly better curio.
----------------- Porcelain Doll ---- Tiny Abacus
Studytime-----------11h ----------------- 14
Study weight ------10 ------------------- 16
Base LP ------------ 2750 --------------- 4,000